Vacuum fuel-feed system.



W. JAY.

VACUUM FUEL FEED SYSTEM APPLICATION FILED 1AN.2. I918.

Patent-ed Sept. 17, 1918.

\l/ u- 2 w 7 wzzzyi WEBB JAY, or CHICAGO, ILLINOIS.

VACUUM FUEL-FEED SYSTEM.

To all whom it may concern:

Be it known that I, WEBB JAY, a citizen of the United States, residing at Chicago, inthe county of Cook and State of Illinois, have invented certain new and useful Improvements in Vacuum Fuel-Feed Systems, of which the following is 5 specification, reference being had to the accompanying drawings, forming a part thereof.

The purpose of this invention is toprovide in a vacuum fuel feed system new and improved means for obviating the danger of overflow or discharge of liquid fuel or vapor thereof, from the reserve chamber 111 case of. over-heating of the apparatus. It consists in the elements and features of construction shown and described, as indicated in the claims.

In the drawings Figure l is a side elevation, somewhat diagrammatic. showing a familiar type of vacuum fuel feed system installed upon the engine of an automobile.

Fig. 2 shows the several parts of such system partially in vertical section, and diagrammatically as to their relative positions.

In the drawings, 1 is the main low level fuel supply tank from which a tube, 2, leads to the vacuum chamber or receiving chamber," 3, of the vacuum fuel feed device, of which 4.- is the reserve fuel chamber or reservoir which is supplied from the vacuum chamber by the flow of the liquid past the check valve, 5. 6 is a suction pipe leading from the vacuum chamber, 3, to a source of sue, tion, as the pipe 7, leading to the intake manifold of the engine. 8 is an air vent pipe leading from the upper part of the fuel reserve chamber or reservoir, 4, back to themainlow level fuel supply tank 1, which said pipe enters so as to be open in the upper part thereof above the intended level of the fuel supply therein. It will be understood that the main low level fuel supply tank, 1,

has an air vent, shown at 1*, so that atmospheric pressure is at all times operative in the upper part of that tank, upon the liquid therein, as well as for access through the air vent pipe, 8. It will be understood that the vacuum chamber, 3, has an atmosphere inlet as shown at 3, and that-any familiar or Specification of Letters Patent.

Patented Sept. 17, 1918.

Application filed January 2, 1918. Serial No. 209,873.

suitable means mav be employed to alternate V with the valves, 11 and 172, which control respectively the suction and the atmospheric inlet opera-ted by a. float, 13, to change the dominance upon change of level of liquid in the vacuum chamber.

The operation of this device in supplying the carbureter is that which is perfectly familiar. The feature which distinguishes the invention embodied in this structure, is that the atmospheric pressure for permitting discharge by gravity of the liquid 'fuel from the fuel reserve chamber, -l, is transmitted through the ipe, 8, from the upper part of the main fuel supply tank. 1. so that in case of overheating of the device, causing expansion of the liquid fuel in the reserve fuel chamber, 4, or in both that chamber and the vacuum chamber 3, under any circumstances, the pressure thus generated or the vapor thus produced would find relief through the air vent pipe 8, and any liquid fuel which might be discharged by such pressure will be carried over into the fuel supply chamber, 1, and all danger of, its discharge, either as vapor or liquid, in the vicinity of the engine where damage might be done by its ignition is entirely avoided.

I claimz- I,

In a vacuum fuel feed system, in combination with a vacuum chamber, a main low level fuel tank; a conduit from the main tank to the vacuum chamber, a reservoir or reserve fuel chamber into which the vacuum chamber discharges liquid; a valve controlling such discharge; means for alternating the dominance of suction and pressure on WEBB JAY. 

